<?php
/**
 * Copyright 2011  SURFfoundation
 * 
 * This file is part of ESCAPE.
 * 
 * ESCAPE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * ESCAPE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with ESCAPE.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * For more information:
 * http://escapesurf.wordpress.com/
 * http://www.surffoundation.nl/
 * 
 * Contact: d.vierkant@utwente.nl
 * 
 * @license http://www.gnu.org/licenses/gpl.html GNU GPLv3
 */
?>
<?php
/**
 * Internal relation filter
 * 
 * Removes relation statements with internal URIs (info:fedora/...), these will never match any data from external sources.
 */
class escape_entityresolution_datafilter_InternalRelationFilter implements entityresolution_DataFilter
{
	/**
	 * Filter the data of an entity.
	 * @param entityresolution_Entity $entity
	 */
	public function filterData($entity)
	{
		$properties = $entity->getProperties();

		$filteredProperties = array();
		foreach($properties as $property)
		{
			/* @var $property entityresolution_Property */
			
			$values = $property->getValues();

			$filteredValues = array();
			foreach($values as $value)
			{
				/* @var $value entityresolution_Value */
				
				if(!preg_match('~^info:fedora/~', $value->getValue()))
				{
					$filteredValues[] = $value;
				}
			}
			
			$property->setValues($filteredValues);
			
			if(count($filteredValues) > 0)
			{
				$filteredProperties[] = $property;
			}
		}
		
		$entity->setProperties($filteredProperties);
	}
}